2. (10 points) Two pure-breeding strains of flies are mated, and the F1 are intercrossed. The...

 

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2. (10 points) Two pure-breeding strains of flies are mated, and the F1 are intercrossed. The first strain has curled wings and black bodies. The second strain has straight wings and brown bodies. The F2 progeny are 271 straight wings with brown bodies, 31 curled wings with black bodies, 94 curled wings with brown bodies and 90 straight wings with black bodies. a. (3 points) Which allele is dominant for wing shape, straight or curled? b. (3 points) Which allele is dominant for body color, brown or black? c. (2 points) If the F1 were backcrossed to the straight, wing brown bodied parent, what phenotypes would be produced among the progeny? What would be the proportion of each phenotype? 2. (10 points) Two pure-breeding strains of flies are mated, and the F1 are intercrossed. The first strain has curled wings and black bodies. The second strain has straight wings and brown bodies. The F2 progeny are 271 straight wings with brown bodies, 31 curled wings with black bodies, 94 curled wings with brown bodies and 90 straight wings with black bodies. a. (3 points) Which allele is dominant for wing shape, straight or curled? b. (3 points) Which allele is dominant for body color, brown or black? c. (2 points) If the F1 were backcrossed to the straight, wing brown bodied parent, what phenotypes would be produced among the progeny? What would be the proportion of each phenotype?

Answer rating: 100% (QA)

first Strain Curled wings Black Bodies Straight wings Brown bodies i Second ... View the full answer